** Changed in: linux-hwe (Ubuntu)
Status: Fix Committed => Fix Released
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Title:
[regression] Colour banding and artefacts appear
This bug was fixed in the package linux-hwe - 4.15.0-24.26~16.04.1
---
linux-hwe (4.15.0-24.26~16.04.1) xenial; urgency=medium
* linux-hwe: 4.15.0-24.26~16.04.1 -proposed tracker (LP: #1776336)
* linux: 4.15.0-24.26 -proposed tracker (LP: #1776338)
* Bionic update: upstream
This bug was fixed in the package linux-hwe - 4.15.0-24.26~16.04.1
---
linux-hwe (4.15.0-24.26~16.04.1) xenial; urgency=medium
* linux-hwe: 4.15.0-24.26~16.04.1 -proposed tracker (LP: #1776336)
* linux: 4.15.0-24.26 -proposed tracker (LP: #1776338)
* Bionic update: upstream
This bug was fixed in the package linux - 4.4.0-127.153
---
linux (4.4.0-127.153) xenial; urgency=medium
* CVE-2018-3639 (powerpc)
- powerpc/pseries: Support firmware disable of RFI flush
- powerpc/powernv: Support firmware disable of RFI flush
- powerpc/rfi-flush: Move
Oh, of course, you are right, Mr. Van Vugt.
I tested the linux-hwe kernel 4.13.0-40.45~16.04.1 from xenial-proposed,
and that kernel fixes the regression. This was, of course, tested under
Xenial.
Thank you again for your efforts! :-)
** Changed in: linux-hwe (Ubuntu)
Status: New => Fix
The original xenial may not be affected (kernel 4.4), but xenial users
do have the option of a HWE kernel, which would be affected...
https://launchpad.net/ubuntu/+source/linux-hwe
** Also affects: linux-hwe (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu
This regression does not affect Xenial, so the fix is redundant.
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Title:
[regression] Colour banding and artefacts appear system-wide on an
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag
Kernel fix arrived in Xenial/16.04 via upstream stable v4.4.119.
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Title:
[regression] Colour banding and artefacts appear system-wide on an
Kernel fix arrived in Xenial/16.04 via upstream stable v4.4.119.
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
This bug was fixed in the package linux - 4.13.0-38.43
---
linux (4.13.0-38.43) artful; urgency=medium
* linux: 4.13.0-38.43 -proposed tracker (LP: #1755762)
* Servers going OOM after updating kernel from 4.10 to 4.13 (LP: #1748408)
- i40e: Fix memory leak related filter
Accepting the Bionic verification for Artful.
** Tags removed: verification-needed-artful
** Tags added: verification-done-artful
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Title:
In *Bionic*, the kernel in proposed (4.15.0-13.14) and in release
(4.15.0-12.13) both fix this regression.
I won't test the fix on Artful; I don't have the system installed and I
don't want to spend the time since Artful won't be supported for very
long anyway (and this bug affects only very few
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag
This bug was fixed in the package linux - 4.15.0-12.13
---
linux (4.15.0-12.13) bionic; urgency=medium
* linux: 4.15.0-12.13 -proposed tracker (LP: #1754059)
* CONFIG_EFI=y on armhf (LP: #1726362)
- [Config] CONFIG_EFI=y on armhf, reconcile secureboot EFI settings
*
** Also affects: linux (Ubuntu Bionic)
Importance: Medium
Assignee: Kai-Heng Feng (kaihengfeng)
Status: Confirmed
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Fix Committed
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** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Status: New => Fix Committed
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** Description changed:
+ === SRU Justification ===
+ [Impact]
+ Color dithering not working correctly because the graphics driver
+ assumes the panel support 8bpc, but the panel only supports 6bpc.
+
+ [Test]
+ User reports the issue start appearing from v4.8-rc2.
+ The issue is fixed with the
It's already in the upstream. We only need to backport it to Artful's
kernel.
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Title:
[regression] Colour banding and artefacts appear
Thank you for your efforts. I honestly hadn't expected this issue to be
fixed or even looked at (especially since it seemingly only affects
users with this specific laptop model) and I am positively surprised.
Am I correct in assuming that one of you will now push a fix to
upstream? :-)
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
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Title:
[regression] Colour banding and artefacts
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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Title:
[regression] Colour banding and artefacts appear system-wide on an
Asus
Thanks for those files. They seem to confirm that the kernel change in
comment #16 is the cause of the regression.
So the kernel is basically doing the right thing in trying to support
all screen types. Only your screen contains inadequate firmware to be
able to tell the kernel what it really is.
Okay, I googled the procedures, but in case they're wrong I'm logging
them here:
I used the kernel provided by Feng for this procedure (4.15.0-9).
- Chose Advanced options in grub menu, selected kernel and pressed 'e'.
- Added 'drm.debug=0x0e' to the end of the 'linux' line.
- Pressed Ctrl+x and
Could you please be a bit more specific? I haven't done this before, you
see. By 'mainline kernel' do you mean the kernel that you provided in
your previous post? And how do I boot with a kernel parameter (from grub
maybe?) and where do I find the dmesg afterwards?
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Thanks for your testing.
Can you boot mainline kernel with kernel parameter "drm.debug=0x0e", and attach
the dmesg?
This will help me write commit log.
Thanks!
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Congratulations Mr. Feng, the kernel you provided fixes the issue
completely! Colours now display as fine as on my Ubuntu 16.04 install.
That is just great.
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Please try this kernel,
http://people.canonical.com/~khfeng/lp1749420/
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Title:
[regression] Colour banding and artefacts appear system-wide on
The colour artefacts seems to have been introduced in 4.8-RC2. 4.8-RC1 is
**not** affected.
In case it's relevant: I downloaded and installed the kernels with UKUU as
before (which uses kernels from Ubuntu mainline repo).
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** Attachment added: "edid-decoded.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420/+attachment/5056594/+files/edid-decoded.txt
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It probably doesn't matter, but in case it does: the outputs were
produced on 18.04 under Xorg and kernel 4.13.
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Title:
[regression] Colour
** Attachment added: "Output of sudo get-edid | parse-edid > edid.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420/+attachment/5056593/+files/edid.txt
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I guess we can also bisect to the exact bad commit and report it to i915
developers.
> If it's any help, this problem seems to have been introduced in kernel
4.8. I tested different kernels with UKUU. Kernels prior to 4.8 do not
have the colour banding issue.
Please find which v4.8-rc* release
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